<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.bootcdn.net/ajax/libs/vue/2.6.14/vue.js"></script>
</head>
<body>
    <div id="app">
        <!-- 父到子,通过属性绑定,v-bind:,简写: -->
        <!-- 父组件通过v-on,简写@ -->
        <son :money="money" @pay="money -= $event"></son>
    </div>
</body>
<script>
    Vue.component('son',{
        //子组件接收数据 ,设置动态参数
        props: ['money'],
        template: `
            <div>
                <h3>子组件-{{money}}</h3>
                <button @click="handleClick">cost</button>
            </div>
        `,
        methods: {
            handleClick(){
                //子到父,通过$emit
                this.$emit('pay', 100)
            }
        }
    })
    new Vue({
        data() {
            return {
                money: 1000
            }
        },
        el: '#app'
    })
</script>
</html>